Target Exam

CUET

Subject

Physics

Chapter

Current Electricity

Question:

Two wires of copper have lengths L and 2L and cross sectional area 2A and A, respectively. The ratio of their specific resistance would be-

Options:

1 : 2

1 : 8

1 : 1

1 : 4

Correct Answer:

1 : 1

Explanation:

The correct answer is Option (3) → 1 : 1

Specific Resistance of a material (ρ) is -

$ρ=R\frac{A}{L}$

However,

Specific Resistance is an material property and therefore would remain same for both the copper wire.